has parent hydride tertiary alpha-hydroxy ketone tigliane cyclic ketone enone tetracyclic diterpenoid phorbol CHEBI:8116 A diterpenoid with the structure of tigliane hydroxylated at C-4, -9, -12(β), -13 and -20, with an oxo group at C-3 and unsaturation at the 1- and 6-positions.